Equine Herpes Myeloencephalopathy (EHM) Updates:

EHV-1 Quarantine in San Bernardino County

December 9, 2019: No new cases. Four (4) of the EHV-1 positive horses have had two (2) negative tests seven (7) days apart. The other three (3) EHV-1 positive horses have not yet met the testing requirement so the entire premise is still under quarantine. CDFA continues to monitor the situation. 

November 27, 2019: One additional exposed horse on the index premise, a 12-year-old Quarter Horse mare, became febrile and has been confirmed positive for EHV-1. CDFA continues to monitor the situation.

November 25, 2019: One additional exposed horse on the index premise, an 11-year-old Paint stallion, became febrile and has been confirmed positive for EHV-1. To date, a total of four (4) horses have been neurologic and an additional five (5) horses have become febrile, all of which have been confirmed positive for EHV-1. Three (3) of the neurologic horses were euthanized due to severity of clinical signs and all other horses on the property are alive and recovering. CDFA is onsite and continues to monitor the situation. 

November 19, 2019: One additional exposed horse on the index premise, a 24-year-old Quarter horse mare, exhibiting neurological signs has been confirmed positive for EHV-1. Two additional febrile horses, a 22-year-old Paint mare and an 11-year-old Paint mare, have also been confirmed positive for EHV-1. CDFA is onsite to observe biosecurity protocols and isolation of positive horses.

November 18, 2019: One of the confirmed EHV-1 positive febrile horses on the index premise developed severe neurologic signs and was euthanized on Saturday November 16.  CDFA continues to monitor the situation. 

November 14, 2019: One additional horse, a 22-year-old Paint gelding, has been confirmed positive for EHV-1 myeloencephalopathy on the index premise. The horse was euthanized due to the severity of clinical signs.  Three additional febrile horses on the premise have also been confirmed positive for EHV-1. 

CDFA continues to monitor the situation. 

November 6, 2019:  A 13-year-old Quarter Horse mare in San Bernardino county displaying neurologic signs and fever has been confirmed positive for Equine Herpesvirus-1. The mare was euthanized due to severity of symptoms on October 29, 2019 and was confirmed positive on necropsy on November 5, 2019.  Twenty (20) exposed horses on the home premise have been quarantined with enhanced biosecurity measures including twice daily temperature monitoring. Any horse displaying clinical signs or a temperature over 101.5F shall be reported to the veterinarian for evaluation and potential nasal swab and blood sampling.

The positive horse has no epidemiological links to any other EHV-1 cases in California and there has been no recent movement off of the property. CDFA will continue to monitor the situation. 

 

 

EHV-1 Quarantine RELEASED in Alameda County

November 5, 2019: All positive horses on the quarantined premise have had two (2) negative tests seven (7) days apart. The quarantine has been released. There are no EHV quarantines in Alameda County at this time. 

November 4, 2019:  No additional confirmed cases. CDFA continues to monitor the situation.

November 1, 2019:  No additional confirmed cases. CDFA continues to monitor the situation.

October 29, 2019: No additional confirmed cases. CDFA continues to monitor the situation.

October 25, 2019: Two additional horses have been confirmed positive for EHV-1 from the exposed barn at the premise in Alameda County. The 16yr old Quarter Horse and 20yr old Warmblood mares have been febrile but have displayed no neurologic signs. They have been isolated and are under veterinary care. CDFA continues to monitor the situation.

October 24, 2019: CDFA onsite to verify compliance with quarantine biosecurity requirements.

October 22, 2019: No additional confirmed cases. CDFA continues to monitor the situation.

October 20, 2019: No additional confirmed cases. CDFA conducted an onsite visit to confirm that all exposed horses continue to have temperatures monitored twice daily and enhanced biosecurity measures have been implemented. 

October 19, 2019: An exposed horse on the quarantined Alameda county premises has been confirmed positive for Equine Herpesvirus-1. This 9- year-old gelding displayed neurologic signs and has been moved off site for isolation and veterinary care. The premises has instituted quarantine required biosecurity measures and all exposed horses continue to be temperature monitored twice daily. CDFA staff conducted an epidemiological investigation and confirmed that there is no connection between the positive horses in Alameda county and the horses involved in the Shasta county incident. The positive horses on the Alameda county premises had not left the property in the last 6 months. CDFA continues to monitor the situation.

 

October 18, 2019: CDFA has quarantined sixty-four (64) exposed horses in Alameda County on the index premises of the neurologic horse which tested positive for Equine Herpesvirus-1.  CDFA staff were onsite today and have implemented enhanced biosecurity measures which includes twice daily temperature monitoring. CDFA will continue to monitor the situation.

 

October 17, 2019: A 12-year-old Arabian mare originating from a premise in Alameda County displaying neurological signs has been confirmed positive for Equine Herpesvirus-1. The mare is under veterinary care and has been isolated and quarantined. This horse has no history of travel from its home premises. This case is not related to the Shasta County EHV-1 incident.  CDFA is conducting an investigation to identify exposed horses and will provide updates as the investigation continues.